srowen commented on code in PR #39801:
URL: https://github.com/apache/spark/pull/39801#discussion_r1093521381


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala:
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@@ -892,7 +892,7 @@ object NullDownPropagation extends Rule[LogicalPlan] {
  * Other optimizations will take advantage of the propagated foldable 
expressions. For example,
  * this rule can optimize
  * {{{
- *   SELECT 1.0 x, 'abc' y, Now() z ORDER BY x, y, 3

Review Comment:
   Is referring to col by position an important part of what this example is 
showing?



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